18997653 has 16 divisors (see below), whose sum is σ = 27025920. Its totient is φ = 11828736.

The previous prime is 18997633. The next prime is 18997661. The reversal of 18997653 is 35679981.

It is not a de Polignac number, because 18997653 - 2¹⁷ = 18866581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18997603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5628 + ... + 8346.

It is an arithmetic number, because the mean of its divisors is an integer number (1689120).

Almost surely, 2^18997653 is an apocalyptic number.

It is an amenable number.

18997653 is a deficient number, since it is larger than the sum of its proper divisors (8028267).

18997653 is a wasteful number, since it uses less digits than its factorization.

18997653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2876.

The product of its digits is 408240, while the sum is 48.

The square root of 18997653 is about 4358.6297158625. The cubic root of 18997653 is about 266.8291771589.

The spelling of 18997653 in words is "eighteen million, nine hundred ninety-seven thousand, six hundred fifty-three".